水科学进展2023，Vol.34Issue(6)：960-970,11.DOI:10.14042/j.cnki.32.1309.2023.06.013
射流冲刷底泥起动输移规律及机理
Law and mechanism of sediment starting and transportation during jet scouring process
摘要
Abstract
The need to employ a high-speed fluid jet scouring technique is a key to performing the dredging operations underwater.It is of crucial value to effectively improve the efficiency of jet mud-making for river(waterway)dredging and reservoir capacity restoration projects.This article adopts the methods of sediment starting and transportation experiment and flow field numerical simulation using a high-speed jet scouring process to study the influence on the riverbed under several hydraulic factors.The distribution characteristics and attenuation law of jet velocity are thoroughly analyzed,and an effective mechanism of sediment scouring via high-speed jet has been developed.The results indicate that there is an optimal flushing distance during the jet mud-making process that enhances its highest growth rate as well as water turbidity.It has been observed that the time-average velocity distribution and the attenuation of the maximum velocity at the centerline section of the jet cross-section are similar.The growth rate of the jet half-width in the initial development zone remains the same for studied jet velocities.The efficiency of the jet scouring process is directly related to the resistance loss during the jet development and subsequent energy loss upon reaching the bed surface.Therefore,determining an optimal height for jet nozzle arrangement is critical for enhancing the mud-making efficiency.The presented results could potentially transform the existing dredging equipment with an enhanced jet mud-making capacity as well as its speed.关键词
射流冲刷/水库清淤/造浆效率/含沙量/射流速度半宽Key words
jet scouring/reservoir dredging/mud-making efficiency/sediment concentration/jet half-width分类
建筑与水利引用本文复制引用
张文皎,赵连军,王仲梅,赵荥,吕鸣聪..射流冲刷底泥起动输移规律及机理[J].水科学进展,2023,34(6):960-970,11.基金项目
国家自然科学基金资助项目(52209090) （52209090）
河南省重大公益专项项目(201300311600)The study is financially supported by the National Natural Science Foundation of China(No.52209090)and the Science and Technology Major Project of Henan Province,China(No.201300311600). （201300311600）
